Proposal: accept pull requests on GitHub

[Thomas Miedema]

Hello all,

my arguments against Phabricator are here:
https://ghc.haskell.org/trac/ghc/wiki/WhyNotPhabricator.

Some quotes from #ghc to pique your curiosity (there are some 50 more):
 * "is arc broken today?"
 * "arc is a frickin' mystery."
 * "i have a theory that i've managed to create a revision that phab can't
handle."
 * "Diffs just seem to be too expensive to create ... I can't blame
contributors for not wanting to do this for every atomic change"
 * "but seriously, we can't require this for contributing to GHC... the
entry barrier is already high enough"

GitHub has side-by-side diffs
<https://github.com/blog/1884-introducing-split-diffs> nowadays, and
Travis-CI can run `./validate --fast` comfortably
<https://travis-ci.org/ghc/ghc/builds>.

*Proposal: accept pull requests from contributors on
https://github.com/ghc/ghc <https://github.com/ghc/ghc>.*

Details:
 * use Travis-CI to validate pull requests.
 * keep using the Trac issue tracker (contributors are encouraged to put a
link to their pull-request in the 'Differential Revisions' field).
 * keep using the Trac wiki.
 * in discussions on GitHub, use https://ghc.haskell.org/ticket/1234 to
refer to Trac ticket 1234. The shortcut #1234 only works on Trac itself.
 * keep pushing to git.haskell.org, where the existing Git receive hooks
can do their job keeping tabs, trailing whitespace and dangling submodule
references out, notify Trac and send emails. Committers close pull-requests
manually, just like they do Trac tickets.
 * keep running Phabricator for as long as necessary.
 * mention that pull requests are accepted on
https://ghc.haskell.org/trac/ghc/wiki/WorkingConventions/FixingBugs.

My expectation is that the majority of patches will start coming in via
pull requests, the number of contributions will go up, commits will be
smaller, and there will be more of them per pull request (contributors will
be able to put style changes and refactorings into separate commits,
without jumping through a bunch of hoops).

Reviewers will get many more emails. Other arguments against GitHub are
here: https://ghc.haskell.org/trac/ghc/wiki/WhyNotGitHub.

I probably missed a few things, so fire away.

Thanks,
Thomas
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